<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>aa</title>
</head>
<body>

<canvas id="myCanvas" width="200" height="100" style="border:1px solid #d3d3d3;">
    您的浏览器不支持 HTML5 canvas 标签。</canvas>

<script>

    var c=document.getElementById("myCanvas");
    var ctx=c.getContext("2d");
    ctx.font="30px Arial";
    ctx.strokeText("Hello World",10,50);

</script>

</body>
</html>








<script>
    const source = new EventSource('/sseServer?clientId=77');
    source.addEventListener('slide', e => {
        location.reload()
    }, false);
</script>